The Echoplex is a tape delay effects unit, first made in 1959. Designed by engineer Mike Battle,[1] the Echoplex set a standard for the effect in the 1960s; according to Michael Dregni, it is still regarded as "the standard by which everything else is measured."[2] Used by some of the most notable electric guitar players of the 1960s and 1970s, original Echoplexes are highly sought after.
dregni
was invoked but never defined (see the help page).